Electrical Machines
What is/are the advantages of parallel operation of alternators?

All of these
 Increase in reliability
 Increase efficiency under light load conditions
 continuity supply is maintained

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Electrical Machines
In dc machines, the field system has to be provided on stator unlike synchronous machines Where in it could be on any member, because

 it gives more uniform air-gap flux distribution
 commutator action is not possible otherwise
 dc machines are comparatively low rating machines.
 it reduces field structure iron losses

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